Journal of Sports Science and Medicine
Journal of Sports Science and Medicine
ISSN: 1303 - 2968   
Ios-APP Journal of Sports Science and Medicine
Androit-APP Journal of Sports Science and Medicine
©Journal of Sports Science and Medicine (2021) 20, 126 - 132   DOI:

Research article
The Accuracy of a Low-Cost GPS System during Football-Specific Movements
Emiel Schulze1, , Ross Julian1,2,3, Sabrina Skorski1
Author Information
1 Institute of Sports and Preventive Medicine, Saarland University, Saarbrücken, Germany
2 Institute of Neuromotor Behavior and Exercise, University of Münster, Münster, Germany
3 School of Sport and Exercise, Exercise and Sport Research Centre, University of Gloucestershire, England

Emiel Schulze
✉ Institute of Sports and Preventive Medicine; Saarland University, Campus B8.2, 66123 Saarbrücken, Germany
Publish Date
Received: 07-05-2019
Accepted: 04-01-2021
Published (online): 01-03-2021
Share this article

An affordable player monitoring solution could make the evaluation of external loading more accessible across multiple levels of football (soccer). The present study aimed to determine the accuracy of a newly designed and low-cost Global Positioning System (GPS) whilst performing match-specific movement patterns. Sixteen professional male football players (24 ± 3 years) were assigned a GPS device (TT01, Tracktics GmbH, Hofheim, Germany) and completed two experimental trials. In each trial, a continuous protocol including seven movements (sideways cornering, diagonal cornering, accelerating, decelerating, backwards jogging, shuttle running, and skipping) adding up to 500 m, was completed. Time-motion data was compared with criterion distance and velocity (photo-cell timing gates and radar). Validity was assessed through the standard error of the estimate (SEE) and reliability through the coefficient of variation (CV; both with 95% confidence limits). For the total distance covered during the protocol, the system was found to be valid (SEE = 3.1% [2.2; 5.8]) and reliable (intra-device CV = 2.0% [1.2; 7.6]). Similar results were found for velocity (SEE = 3.4% [2.6; 4.8], CV = 4.7% [3.2; 8.5]). In conclusion, the present GPS system, a low-cost solution, was found to be a valid and reliable tool for measuring physical loading during football-specific movements.

Key words: Soccer, team sports, external load, precision, motion analysis

           Key Points
  • A newly designed and low-cost GPS system was found to provide reliable and valid data describing physical loading during football-specific movements.
  • The system showed accurate measurements at higher running velocities, potentially due to different positioning of the devices on the body.
  • The system relies on more affordable hardware components, offering a lower financial burden and making it available across a wider range of teams.
Home Issues About Authors
Contact Current Editorial board Authors instructions
Email alerts In Press Mission For Reviewers
Archive Scope
Supplements Statistics
Most Read Articles
  Most Cited Articles
JSSM | Copyright 2001-2020 | All rights reserved. | LEGAL NOTICES | Publisher

It is forbidden the total or partial reproduction of this web site and the published materials, the treatment of its database, any kind of transition and for any means, either electronic, mechanic or other methods, without the previous written permission of the JSSM.

This work is licensed under a Creative Commons License Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.